程序運行截圖如下：

源碼如下：

myglwidget.h

#ifndef MYGLWIDGET_H #define MYGLWIDGET_H#include <QOpenGLWidget> #include <QWidget> class SkyBox;class MyGLWidget : public QOpenGLWidget {Q_OBJECT public:explicit MyGLWidget(QWidget *parent = 0);SkyBox *m_skybox;double m_axle_X;double m_axle_Y;double m_rotate_value;int m_verticalValue;public slots:protected:void initializeGL();void resizeGL(int w,int h);void paintGL(); };#endif // MYGLWIDGET_H

skybox.h

#ifndef SKYBOX_H #define SKYBOX_H#include <GL/gl.h> #include <GL/glu.h> #include <QString> class QImage;class SkyBox { public:SkyBox();void draw();void Init(); protected:GLuint CreateTexture2DFromBMP(const char*bmpPath);unsigned char * LoadFileContent(const char *path, int &filesize);unsigned char *DecodeBMP(unsigned char*bmpFileData, int&width, int&height);GLuint createTexture2D(unsigned char *piexlData, int width, int height, GLenum type); private:GLuint m_textures[6];};#endif // SKYBOX_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void upBtnClicked();void downBtnClicked();void leftBtnClicked();void rightBtnClicked();private:Ui::Widget *ui; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

myglwidget.cpp

#include "myglwidget.h" #include <GL/glu.h> #include <QDebug> #include "skybox.h"MyGLWidget::MyGLWidget(QWidget *parent) : QOpenGLWidget(parent) {m_skybox=new SkyBox;m_axle_X=0.0;m_axle_Y=0.0;m_rotate_value=0.0;m_verticalValue=0; }void MyGLWidget::initializeGL() {glMatrixMode(GL_PROJECTION);gluPerspective(50.0f,800.0f/600.0f,0.1f,1000.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();m_skybox->Init(); }void MyGLWidget::resizeGL(int w, int h) {Q_UNUSED(w)Q_UNUSED(h) }void MyGLWidget::paintGL() {glClearColor(0.0f,0.0f,0.0f,1.0f);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);m_skybox->draw();if(m_axle_X==1){if(m_verticalValue>=90||m_verticalValue<=-90){return;}}glRotatef(m_rotate_value,m_axle_X,m_axle_Y,0.0); }

skybox.cpp

#include "skybox.h" #include <QImage> #include <QDebug> #include <QFile>SkyBox::SkyBox() {}void SkyBox::draw() {glDisable(GL_DEPTH_TEST);glEnable(GL_TEXTURE_2D);glBindTexture(GL_TEXTURE_2D, m_textures[0]);glBegin(GL_QUADS);glColor4ub(255,255,255,255);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,-0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[1]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[2]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(-0.5f,0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[3]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f, 0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(0.5f,0.5f,-0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[4]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f,0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D,m_textures[5]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glEnd(); }void SkyBox::Init() {m_textures[0]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\front.bmp");m_textures[1]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\back.bmp");m_textures[2]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\left.bmp");m_textures[3]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\right.bmp");m_textures[4]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\top.bmp");m_textures[5]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\bottom.bmp"); }GLuint SkyBox::CreateTexture2DFromBMP(const char *bmpPath) {int nFileSize=0;unsigned char *bmpFileContent=LoadFileContent(bmpPath,nFileSize);if (bmpFileContent==nullptr){return 0;}int bmpWidth=0,bmpHeight=0;unsigned char*pixelData=DecodeBMP(bmpFileContent,bmpWidth,bmpHeight);if (bmpWidth==0){delete bmpFileContent;return 0;}GLuint texture=createTexture2D(pixelData,bmpWidth,bmpHeight,GL_RGB);delete bmpFileContent;return texture; }unsigned char *SkyBox::LoadFileContent(const char *path,int &filesize) {unsigned char*fileContent=nullptr;filesize=0;FILE*pFile=fopen(path,"rb");if(pFile){fseek(pFile,0,SEEK_END);int nLen=ftell(pFile);if(nLen>0){rewind(pFile);fileContent=new unsigned char[nLen + 1];fread(fileContent,sizeof(unsigned char),nLen,pFile);fileContent[nLen] ='\0';filesize=nLen;}fclose(pFile);}return fileContent; }unsigned char *SkyBox::DecodeBMP(unsigned char *bmpFileData,int &width,int &height) {if (0x4D42==*((unsigned short*)bmpFileData)){int pixelDataOffset=*((int*)(bmpFileData+10));width=*((int*)(bmpFileData+18));height=*((int*)(bmpFileData+22));unsigned char*pixelData=bmpFileData+pixelDataOffset;for (int i=0;i<width*height*3;i+=3){unsigned char temp=pixelData[i];pixelData[i]=pixelData[i+2];pixelData[i+2]=temp;}return pixelData;}return nullptr; }GLuint SkyBox::createTexture2D(unsigned char *piexlData, int width, int height, GLenum type) {GLuint texture;glGenTextures(1,&texture);glBindTexture(GL_TEXTURE_2D,texture);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);glTexImage2D(GL_TEXTURE_2D,0,type,width,height,0,type,GL_UNSIGNED_BYTE,piexlData);return texture; }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include "skybox.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);connect(ui->upPushButton,SIGNAL(clicked(bool)),this,SLOT(upBtnClicked()));connect(ui->downPushButton,SIGNAL(clicked(bool)),this,SLOT(downBtnClicked()));connect(ui->leftPushButton,SIGNAL(clicked(bool)),this,SLOT(leftBtnClicked()));connect(ui->rightPushButton,SIGNAL(clicked(bool)),this,SLOT(rightBtnClicked())); }Widget::~Widget() {delete ui; }void Widget::upBtnClicked() {ui->openGLWidget->m_axle_X=1.0;ui->openGLWidget->m_axle_Y=0.0;ui->openGLWidget->m_rotate_value=-2.0;ui->openGLWidget->m_verticalValue+=1;ui->openGLWidget->update(); }void Widget::downBtnClicked() {ui->openGLWidget->m_axle_X=1.0;ui->openGLWidget->m_axle_Y=0.0;ui->openGLWidget->m_rotate_value=2.0;ui->openGLWidget->m_verticalValue-=1;ui->openGLWidget->update(); }void Widget::leftBtnClicked() {ui->openGLWidget->m_axle_X=0.0;ui->openGLWidget->m_axle_Y=1.0;ui->openGLWidget->m_rotate_value=-2.0;ui->openGLWidget->update(); }void Widget::rightBtnClicked() {ui->openGLWidget->m_axle_X=0.0;ui->openGLWidget->m_axle_Y=1.0;ui->openGLWidget->m_rotate_value=2.0;ui->openGLWidget->update(); }

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